Ah, that would've been awesome, thanks but after my search around various forums today, it seems that's one of those sound cards that unfortunately post-processes the SPDIF input streams, resulting in non-exact captures of the digital audio. While it still works for regular PCM audio streams, it will render non-PCM (AC-3, DTS) datastreams useless.

The M-Audiophile 2496 and AudioTrak Prodigy 7.1 should be able to handle it. As I own a LD player with an RF demodulator and other discs with tracks I'm interested in getting preserved, it may be time for me to buy a new soundcard, will keep you updated.